Structure and Optical Properties of b¢-Phase of Ag₈SnSe₆

Energy dispersive x-ray spectroscopy of lowtemperature b¢-Ag<sub>8</sub>SnSe<sub>6</sub> crystalcarried out. Energy dispersive spectrum shows only peaks related to Ag<sub>8</sub>SnSe<sub>6</sub>. Experimental optical absorption spectrum and band gap value 0.82 eV are determined. Theoretical calculation of absorption spectrum shows good agreement with experimental studies. Modeling of crystal structure of Ag<sub>8</sub>SnSe<sub>6</sub> argyrodite and interatomic distances calculation are carried out. Keywords: argyrodite, chalcogenides, energy dispersive analysis, optical absorption spectra, crystal structure